Metal bearing



Patented Apr. 14, 1925.

UNITED STATES PATENT OFFICE.

JAMES G. KELLY, ALBERT L. PRINGLE, AND HOLMES HALL, SEDALIA, MISSOURI,

SAID PRINGLE ASSIGNOR T0 SAID KELLY AND HALL.

METAL BEARING.

No Drawing.

To all whom it may concern:

Be it known that we, JAMES G. KELLY, ALBERT L. PRINGLE, and HOLMES HALL,citizens of the United States, residing at the city of Sedalia, in thecounty of Pettis and State of Missouri, have invented certain new anduseful Improvements in Metal Bearings, of which the following is aspecification.

This invention relates to a bearing metal made of aluminum, tin, andlead, wherein the proportion of tin is greater than of the other metals,in order to give greater body and to insure the desired smoothness anddurability of the composition.

In making this bearing metal, it has been found desirable-to use aboutsixty-six and two-thirds per cent (66 70) of tin, sixteen and two-thirdsper cent (16 lead, and sixteen and two-thirds per cent (16 7 aluminum.Thus about two thirds of the entire composition by weight is of tin, andabout one-sixth by weight is of aluminum, and about one-sixth by weightis of lead.

These proportions are intended for a high grade and a high speed bearingmetal, such as can be used in automobiles, tractors, locomotives,electrical machinery, and the like. The aluminum is used to ive hardnessand toughness to the composltion; the tin to give body tovthe whole, andis, also a desirable ingredient because it increases the durability andsmoothness of the metal; and the lead is used as a binder to hold theother ingredients together, and makes a more perfect physical union ofthe whole. The three metals combined in substantially these proportionsform a very close-grained metal that is unusually .smooth and verytough, and with entire absence of brittleness and tendency towardcrystallization. Crystallization is a common fault in bearingIl'lGlLillS, many of which contain copper,

antimony, or zinc, any of which ingredients causes more or less frictionand, therefore, heat, which results in crystallization. The compositionof the bearing metal of this invention contains no heat-producing metalor any that causesundue friction.

While the general nature of this composition is one of substantiallytwo-thirds 1 by weight tin, and one-sixth 4;)

Application filed August 20, 1920. Serial No. 404,864.

by weight of each of the other ingredients, yet these proportions may bevaried and still come within the scope of this invention and thefollowing claims. For example, in making a bearing metal for heavytractor engines, for large derricks or steam shovels, or for heavymachines like the"tanks used in the late war, where there is greatweight and strain, it possibly would be advisable to increase thepercentage of aluminum or tin, or both. On the other hand, for use 1nhigh speed machines without great weight or friction, it might beadvisable to increase the proportion of block tin. Agaln, if used formetallic packing, it would probably be advisable to soften the compo-'sitlon by increasing the proportion of lead and decreasing theproportion of either or both the block tin and the aluminum. If,however, one standard metal for all these different uses were made, thebest general results will be attained if the proportions as set forthabove are substantially observed.

Having thus described this invention, we hereby reserve the benefit ofall changes in form, arrangement, order, or use of parts, as it isevident that many minor changes may be made therein without departingfrom the spirit of this invention or the scope of the following claims.

We claim:

1. A metal bearing composed of aluminum, tin, and lead, with thealuminum eonstltuting approximately one-sixth A,) of the whole, and theremainder consisting of lead and tin, each being present in substantialamounts but the tin in a predominating quantity. -2. A metal bearingcomposed predominately of tin together with approximately equalproportions of lead and aluminum, the latter being present in aproportion sufiicient' to harden the alloy without producing asubstantial amount of internal friction or crystallization when thebearing is in use.

3. A metal bearin composed of one-sixth aluminum, two-thir s tin andone-sixth lead.

In testimony whereof we hereunto atiix our signatures.

JAMES G. KELLY. ALBERT L. PRINGLE HOLMES HALL.

